A two-dimensional hybrid of molybdenum carbide (Mo₂C) and reduced graphene oxide (RGO) was developed as an efficient electrocatalyst for the hydrogen evolution reaction (HER). This hybrid, named Mo₂C@NPC/NPRGO, was synthesized using a ternary nanocomposite of polyoxometalate (POMs), polypyrrole (PPy), and RGO as a precursor. The hybrid exhibited excellent electrocatalytic activity for HER with a low onset overpotential of 0 mV (vs RHE), a small Tafel slope of 33.6 mV dec⁻¹, and high stability in acidic media. Its performance was comparable to commercial Pt-C catalysts and superior to previously reported non-noble-metal catalysts. Theoretical calculations using density functional theory (DFT) revealed that the active sites for HER stemmed from pyridinic nitrogen and carbon atoms in the RGO. The hybrid's structure, which includes Mo₂C NPs encapsulated by N, P-codoped carbon shells and N, P-codoped RGO, prevented aggregation and enhanced electron transfer. The catalyst's high surface area and porous structure facilitated electrolyte penetration and charge transfer. The study also demonstrated the effectiveness of using POMs, PPy, and RGO as a ternary hybrid for designing efficient HER catalysts. The results highlight the potential of this hybrid for hydrogen production and other electrochemical applications.A two-dimensional hybrid of molybdenum carbide (Mo₂C) and reduced graphene oxide (RGO) was developed as an efficient electrocatalyst for the hydrogen evolution reaction (HER). This hybrid, named Mo₂C@NPC/NPRGO, was synthesized using a ternary nanocomposite of polyoxometalate (POMs), polypyrrole (PPy), and RGO as a precursor. The hybrid exhibited excellent electrocatalytic activity for HER with a low onset overpotential of 0 mV (vs RHE), a small Tafel slope of 33.6 mV dec⁻¹, and high stability in acidic media. Its performance was comparable to commercial Pt-C catalysts and superior to previously reported non-noble-metal catalysts. Theoretical calculations using density functional theory (DFT) revealed that the active sites for HER stemmed from pyridinic nitrogen and carbon atoms in the RGO. The hybrid's structure, which includes Mo₂C NPs encapsulated by N, P-codoped carbon shells and N, P-codoped RGO, prevented aggregation and enhanced electron transfer. The catalyst's high surface area and porous structure facilitated electrolyte penetration and charge transfer. The study also demonstrated the effectiveness of using POMs, PPy, and RGO as a ternary hybrid for designing efficient HER catalysts. The results highlight the potential of this hybrid for hydrogen production and other electrochemical applications.